請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/5251
標題: 以沸石擔持二氧化鈦光觸媒之製備方法及特性研究
Study on the Preaparation and Characterization of Zeolite Supported TiO2 Photocatalyst
作者: 謝佑岱
Shie, Yao-Dai
關鍵字: Titanium Dioxide
二氧化鈦
Zeolite
Photocatalytic
沸石
光催化
出版社: 環境工程學系所
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摘要: 本研究探討以沸石(zeolite)結合光觸媒TiO2之複合式觸媒及其最佳製備TiO2粉體之溶膠成分比例和觸媒表面特性之研究。TiO2粉體是經由溶液凝膠法(Sol-Gel法)的製備,並採用田口式實驗計劃法找到其最佳製備條件,而TiO2/zeolite之複合式觸媒,則是由物理性以及化學性兩種披覆方式搭配沸石所組合而成。 實驗結果顯示,將TTIP、乙醇(EtOH)及二甘醇(DEG)之莫耳數比控制在1:40:0.5,並且經過600℃鍛燒90 min後,可得到光催化活性最佳之TiO2光觸媒,且利用化學性的結合方式將TiO2光觸媒披覆在沸石(zeolite)上的組合,將有較佳的沉降效果、結合強度和污染物去除效果。找出最佳之TiO2粉體配方製備比例後,接著探討TiO2/ zeolite複合式觸媒之最佳反應結合比例和pH值,結果發現結合重量百分比TiO2佔約90 %在pH為7之情況下,將會有較佳的亞甲基藍去除效果之呈現。 經由SEM (EDS)、XRD等表面分析結果,TiO2之結晶構造主要為Anatase晶型,而且當其披覆在沸石上後,並不會對TiO2光觸媒的特性造成改變,經由觸媒沈降實驗證實,TiO2/zeolite之複合式觸媒可提升約40%~70%之沈降效果,將增加實場應用之可行性。將TiO2及不同披覆比例之複合式觸媒進行光催化實驗所得的數據進行反應動力的模擬,其結果是符合一階的反應模式,推測經過一小時吸附已達飽和,觸媒表面進行著動態平衡的吸附作用。
This investigation aimed at the preparation and characterization of zeolite-supported TiO2 photocatalyst. TiO2 photocatalyst was prepared by the sol-gel technique based on Taguchi's experimentaled method. In addition, TiO2/zeolite catalysts were synthesized by physical and chemical approaches. The results indicated that the best candidate of TiO2 photocatalyst was obtained at a molar ratio of TTIP to ethanol (EtOH) to diethylene glycol (DEG) of 1: 40: 0.5, calcination at 600℃ for 90 minutes. The TiO2/zeolite photocatalyst synthesized by the chemical approach exhibited the best settling ability, binding strength and photocatalysic performance. The photocatalyst of 90 wt % TiO2 resulted in the best color removal at pH 7. Based on the analysis of SEM-EDS and XRD, the results show that the grain size of TiO2 was about 50 nm and the crystal structure was mainly anatase form. Integration with zeolite does not change the structure and chemical properties of the TiO2 powder. In kinetic analysis , the photodegradation of methylene blue by TiO2/zeolite photocatalyst fits the pseudo-first-order kinetics.
URI: http://hdl.handle.net/11455/5251
其他識別: U0005-0407200715341800
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-0407200715341800
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